2.5.1.2
Rate Compensating Detectors
Detectors shall be [surface] [flush] mounted [vertical] [horizontal] type,
with outlet box supported independently of wiring connections. Detectors
shall be hermetically sealed and automatically resetting. Rate Compensated
detectors shall be rated for 15 by 15 m 50 by 50 ft.
2.5.1.3
Fixed Temperature Detectors
Detectors shall be designed for [surface] [semi-flush] outlet box mounting
and supported independently of wiring connections. Detectors shall be
designed to detect high heat. The detectors shall have a specific
temperature setting [of [57.2] [_____] degrees C [135] [_____] degrees F]
[as shown]. The UL 521 test rating for the fixed temperature detectors
shall be rated for 4.57 by 4.57 m 15 by 15 ft.
2.5.2
Smoke Detectors
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NOTE: Choose the type of smoke detector most suited
for application or design.
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Smoke detectors shall be designed for detection of abnormal smoke
densities. Smoke detectors shall be [ionization] [photoelectric] [or]
[projected beam] type. Detectors shall contain a visible indicator LED
that shows when the unit is in alarm condition. Detectors shall not be
adversely affected by vibration or pressure. Detectors shall be the
plug-in type in which the detector base contains terminals for making
wiring connections. Detectors that are to be installed in concealed (above
false ceilings, etc.) locations shall be provided with a remote indicator
LED suitable for mounting in a finished, visible location.
2.5.2.1
Ionization Detectors
Ionization detectors with a dual chamber shall be responsive to both
invisible and visible particles of combustion. One chamber shall be a
reference chamber and the second a sampling chamber. Detectors containing
radium shall not be provided. Detectors shall not cause an alarm condition
due to anticipated fluctuations in relative humidity. The sensitivity of
the detector shall be field adjustable to compensate for operating
conditions. Detector shall require no replacement or readjustment to
restore it to normal operation after an alarm condition. Each detector
shall be capable of withstanding ambient air velocity up to [1.5] [_____]
meters/second [300] [_____] fpm in accordance with UL 268.
2.5.2.2
Photoelectric Detectors
Detectors shall operate on a light scattering concept using an LED light
source. Failure of the LED shall not cause an alarm condition. Detectors
shall be factory set for sensitivity and shall require no field adjustments
of any kind. Detectors shall have an obscuration rating in accordance with
UL 268.
2.5.2.3
Projected Beam Smoke Detectors
Detectors shall be designed for detection of abnormal smoke densities.
Detectors shall consist of separate transmitter and receiver units. The
SECTION 13850A
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